Hi Greg,
Try turning the red lever in your Nautilus panel to the position depicted in the "Winterize" diagram. (That "bypass valve" turns off flow into the water heater.) Then try running the hot water faucets. If they then flow well (with cold water) then the problem is most likely to be the "check valve" on the top of the back of your water heater. That's where the hot water for your trailer comes out of the tank.
The check valve isn't unnecessary as someone has asserted above; it's there to prevent cold water from being pushed into the hot water tank and increasing the amount of electricity and/or gas required to keep the water in the tank hot. Unfortunately the valve is a common failure point. Fortunately, that means that they are widely available.
In an emergency you can remove it and (with readily-available parts from a hardware store) reconnect the plumbing directly to the tank but it's best not to leave it that way.
Replacing the valve requires opening up the rear wall of the basement storage area, usually the angled portion of the wall which is held in place by three screws down each side. Once the panel is removed you'll see the likely-messy array of wires, plumbing, heating ducts and utility devices including the water heater.
In the less-likely event that after replacing the check valve you STILL have poor hot water pressure, then the problem is most likely at that red hot water bypass valve that you moved at the beginning. This problem is much rarer and parts are NOT available everywhere. The company that makes the Nautilus panel is here:
http://www.bandbmolders.com/
Good luck.
